Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 115, NWS Tulsa, OK

May 6, 2001Creek County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 6, 2001, 11:49 PM CDT for Creek County, Oklahoma. It was in force for 41 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: May 6, 2001, 11:49 PM CDT (04:49 UTC)
Expired: May 7, 2001, 12:30 AM CDT
In force: 41 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Creek County, OK

The radar

The Tulsa radar (KINX), 83 km from the middle of the area, began a volume at 04:52 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
May 6, 11:58 PM CDT	Hail 0.75	Bristow, OK

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 6, 7:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.8 hours before the alert went out and 114 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 485 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1742 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -31 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KTSA 070449
SVRTUL
OKC037-070530-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
1149 PM CDT SUN MAY 6 2001

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CREEK COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 1230 AM CDT

* AT 1149 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 2
  MILES WEST OF BRISTOW...MOVING SOUTHEAST AT 15 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...DEPEW...SLICK
  AND BRISTOW.

HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN
THE WARNED AREA.

LAT...LON 3595 9641 3583 9655 3564 9639 3567 9622
          3576 9618

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 6, 9:55 PM CDT, 1 hour 54 minutes earlier.

Area forecast discussion, May 6, 9:55 PM CDT, 1 hour 54 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
955 PM CDT SUN MAY 6 2001

ALREADY TWEAKED FORECAST EARLIER FOR KEEPING POPS IN FORECAST ALL
NIGHT IN MOST AREAS. STORMS ALONG FRONT IN OSAGE COUNTY NOT MOVING
VERY QUICKLY SO HARD TO TAKE OUT ANY COUNTIES FROM THE WATCH. WILL
PLAN ON KEEPING ALL BUT FAR NW COUNTIES IN THE WATCH UNTIL
EXPIRATION UNLESS ALL STORMS DIE COMPLETELY.

AIRMASS JUST AHEAD OF FRONT HAS STABILIZED EVEN MORE DUE TO LOSS OF
HEATING AND PRIOR CONVECTION. CONVERGENCE ALONG FRONT IS ALSO ILL
DEFINED WITH LIGHT AND VARIABLE WINDS ACROSS MOST OF NE OK AND NW
AR. THINK SVR POTENTIAL WILL BE ISOLATED AT BEST FOR THE REMAINDER
OF THE NIGHT AS WEAK 850MB FLOW BECOMES EVEN WEAKER TONIGHT. BEST
CHANCE IN FAR SE ZONES. 00Z MESOETA FIRES CONVECTION BACK UP AFTER
MIDNIGHT BUT THINK THE COVERAGE WILL BE LESS THAN INDICATED BECAUSE
OF PREVIOUSLY STATED REASONING.? WILL TWEAK FORECAST AGAIN TO SHOW
SLOWER FROPA AND KEEP CHC OF RAIN ALL NIGHT AND INTO EARLY TOMORROW
MORNING IN SE ZONES.

FCSTID = 26

.TSA...
AR...NONE.
OK...NONE.

In the hours before

Local storm report, May 6, 9:42 PM CDT, 2 hours 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
942 PM CDT SUN MAY 06 2001

TIME(CDT)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0530 PM    TULSA                     OK    1 INCH HAIL
05/06/01   TULSA                           REPORTED BY STORM SPOTTER

0625 PM    5 N PRYOR                 OK    1 INCH HAIL
05/06/01   MAYES                           REPORTED BY EMERGENCY
                                           MANAGEMENT

0730 PM    WITTER                    AR    2 INCH HAIL
05/06/01   MADISON                         REPORTED BY THE PUBLIC

0745 PM    BOSWELL                   OK    .75 INCH HAIL
05/06/01   CHOCTAW                         REPORTED BY BOSWELL PD

0905 PM    ELM SPGS                  AR    .75 INCH HAIL
05/06/01   WASHINGTON                      REPORTED BY STATE POLICE

0911 PM    FAYETTEVILLE              AR    .75 INCH HAIL
05/06/01   WASHINGTON                      REPORTED BY STATE POLICE

Local storm report, May 6, 9:45 PM CDT, 2 hours 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
945 PM CDT SUN MAY 06 2001

TIME(CDT)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

094z4 PM    1 N BERRYVILLE            AR    .75 INCH HAIL
05/06/01   CARROLL                         REPORTED BY EMERGENCY
                                           MANAGMENT

Local storm report, May 6, 9:54 PM CDT, 1 hour 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
954 PM CDT SUN MAY 06 2001

TIME(CDT)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0433 PM    10 S PRUE                 OK    .75 INCH HAIL
05/06/01   OSAGE                           REPORTED BY HAM RADIO
                                           SPOTTER

0645 PM    2 SW PRYOR                OK    .75 INCH HAIL
05/06/01   MAYES                           REPORTED BY EMERGENCY
                                           MANAGEMENT

Local storm report, May 6, 10:04 PM CDT, 1 hour 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1004 PM CDT SUN MAY 06 2001

TIME(CDT)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0605 PM    OWASSO                    OK    1.75 INCH HAIL
05/06/01   TULSA                           REPORTED BY HAM RADIO
                                           SPOTTERS

0615 PM    CATOOSA                   OK    .88 INCH HAIL
05/06/01   ROGERS                          REPORTED BT HAM RADIO
                                           SPOTTER

0838 PM    BENTONVILLE               AR    WIND DAMAGE
05/06/01   BENTON                          TREE LIMBS
                                           DOWN...REPORTED BY HAM
                                           RADIO SPOTTERS

Special weather statement, May 6, 11:05 PM CDT, 44 minutes before

ARZ001-002-010-011-019-020-029-OKZ049-053>076-0712000-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
1105 PM CDT SUN MAY 6 2001

...UPDATE FOR SHORT TERM TRENDS...

TORNADO WATCH NUMBER 209 REMAINS IN EFFECT UNTIL 1AM FOR MUCH OF
EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.

THUNDERSTORM ACTIVITY ACROSS THE AREA HAD WEAKENED.  HOWEVER...AN
INCREASE IN THUNDERSTORM ACTIVITY IS LIKELY IN EASTERN OKLAHOMA
DURING THE NEXT 1 TO 3 HOURS AS AN UPPER-LEVEL DISTURBANCE OVER
CENTRAL OKLAHOMA MOVES ACROSS THE REGION DURING THE NIGHT.

THE ATMOSPHERE REMAINS UNSTABLE ACROSS MOST OF THE AREA...WITH THE
GREATEST INSTABILITY IN EAST-CENTRAL OKLAHOMA AND WEST-CENTRAL
ARKANSAS WHERE SURFACE TEMPERATURES AND DEW POINTS REMAIN ELEVATED.
THE NEW THUNDERSTORMS WILL SPREAD INTO WESTERN ARKANSAS LATE
TONIGHT. THE MOST LIKELY AREA TO SEE SEVERE WEATHER DURING THE
NIGHT WILL BE ALONG THE I-40 CORRIDOR.

LOW AND MID-LEVEL WIND FIELDS HAVE WEAKENED...WITH THE MAIN SEVERE
WEATHER THREAT FROM ANY NEW STORMS BEING LARGE HAIL.

SPOTTERS AND EMERGENCY MANAGEMENT AGENCIES SHOULD CONTINUE TO
MONITOR THE SITUATION AND BE READY FOR ACTIVATION AGAIN DURING THE
THE NIGHT.

SEE SHORT TERM FORECASTS FROM THIS OFFICE FOR ADDITIONAL
INFORMATION.

Special weather statement, May 6, 11:35 PM CDT, 14 minutes before

ARZ001-010-019-029-OKZ049-053>076-070423-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1135 PM CDT SUN MAY 6 2001

TORNADO WATCH 209 THAT WAS IN EFFECT FOR ALL OF EASTERN OKLAHOMA
AND PARTS OF NORTHWEST ARKANSAS...HAS BEEN CANCELLED.

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 6, 7:35 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw	40 min
May 6, 8:25 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	65 min
May 6, 8:27 PM CDT	Severe Thunderstorm Warning	TSA	Osage	63 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2001 Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.